TELNET to mail user on Exchange 2010

atredo
atredo used Ask the Experts™
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It must be late in the day.

I need help using telnet to connect to a mail client on exchange and send a test message.

I have an application (TigerPaw) on server1 (AD DC FS DHCP) . It needs to send Pop3 to the server Exchange server to gain aynalitics from our mail campains.
That  is not working, so thay are requireing me to telnet , connect and send a message to prove  the mailserver is allowing pop3 communications.

I set filters in fthe firewalls on both servers with POP wide open (i'll locak it down later).

I can telnet to exchange 110
I cant seem to log in.

what the heck !!!  

Can someone help me out.

This is all on our internal lan. could the network firewall be the problem??

Anyway ... please help

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TolomirAdministrator
Top Expert 2005

Commented:
please check the settings from a mail client that can connect to the server, it might be possible they use TLS connection to pop3 which would be port 995.
TolomirAdministrator
Top Expert 2005

Commented:
Protocol: POP3

    Port (TCP/UDP): 110 (TCP)
    Description: Post Office Protocol version 3, enables "standards-based" clients such as Outlook Express or Netscape Communicator to access the e-mail server. As with IMAP4, POP3 runs on top of the IIS Admin Service, and enables client access to the Exchange 2000 information store.

Protocol: POP3/SSL

    Port (TCP/UDP): 995 (TCP)
    Description: POP3 over SSL. To enable POP3 over SSL, you must install a Computer certificate on the Exchange 2000 server.

Author

Commented:
maybe thats it. Do i need to open UDP 110 in/out on the servers?
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You sure your machine is not blocking the port by chance with windows firewall ? I would also check to make sure the pop3 service is enabled on the exchange box as by defautl ti is now.

Can you telnet to port 25 ?
Administrator
Top Expert 2005
Commented:
I would really check for some outlook client and check their settings to connect to that exchange server.

If exchange is not listening on port 110 there is no need to open a hole in the firewall

Author

Commented:
POP3 is enabled on the Server. I can telnet to 25.  I can open a telnet to 110.
I get +OK The MS exchange pop3 service is ready.
If i enter "USER" i get the  -ERR command is not valid in this state
Mohamed ElManakhlyInfrastructure Team Leader

Commented:
TolomirAdministrator
Top Expert 2005
Commented:
This is what I did find:

http://blog.yimingliu.com/2009/01/23/testing-a-pop3-server-via-telnet-or-openssl/

Nowadays, though, most POP3 servers are secured via SSL, usually sitting on port 995. If you try to use telnet on an SSL-only POP3 server, you’ll either get an error “Command is not valid in this state”.

---

I suggest you change the way of access - not lower the security of the exchange server by allowing unencrypted email transfers.

Author

Commented:
I will tackle this more tomorrow. Thanks for your responses today
Leon FesterSenior Solutions Architect

Commented:
Those sessions are case sensitive.
"USER" is not the same as "user"

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